4698581
Descripción
Test por TRAVIS CANNING, actualizado hace más de 1 año
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Creado por TRAVIS CANNING
hace más de 10 años
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Pregunta 1
Pregunta
_______ on centrifugal air compressors are provided in order to control the amount of air flowing to the impeller and thus control the capacity of the unit.
Respuesta
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Adjustable inlet vanes
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Adjustable diffuser vanes
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Variable frequency drive
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Moving and fixed blades
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Dummy piston
Pregunta 2
Pregunta
The aftercooler is used in an air compression system to cool the:
Respuesta
-
Air after the first stage of compression
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Lubricating oil of large axial compressors
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Air after it leaves the receiver
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Air after the last stage of compression
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Air before being compressed
Pregunta 3
Pregunta
The aftercooler is used in an air compression system to cool the:
Respuesta
-
Air after the first stage of compression
-
Lubricating oil of large axial compressors
-
Air after it leaves the receiver
-
Air after the last stage of compression
-
Air before being compressed
Pregunta 4
Pregunta
Positive displacement compressor types include:
1. Sliding vane
2. Axial flow
3. Internal gear
4. Volute casing
5. Rotary screw
6. Multi lobe
Respuesta
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1,3,4,6
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2,4,5,6
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1,3,5,6
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1,2,4,5
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2,3,5,6
Pregunta 5
Pregunta
Effective intercooling will reduce weakening of parts due to high temperatures, and reduce possibility of:
Respuesta
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Compressor explosions
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Water hammer
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Compressor implosions
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Compressor leaks
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Corrosion
Pregunta 6
Pregunta
In the variable speed control method the compressor output is regulated by:
Respuesta
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Adjustment of clearance pockets
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Valve unloaders
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A safety relief valve
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A driver that can be throttled
Pregunta 7
Pregunta
A method of unloading a reciprocating compressor is to:
Respuesta
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Hold the discharge valve closed
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Hold the discharge valve open
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Place a check valve in the discharge line
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Hold the inlet valves in the open position
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Unloading a cylinder
Pregunta 8
Pregunta
The flow of air from a compressor must be _______ to suit the load requirements and to maintain constant pressure in the system.
Respuesta
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Increased
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Decreased
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Dampened
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Interrupted
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Regulated
Pregunta 9
Pregunta
To prevent surging, the load on the compressor must not be allowed to fall below the:
Respuesta
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Surge limit
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Maximum volume
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Related point
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Rated pressure
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Set point
Pregunta 10
Pregunta
The ________ control method can be used when a compressor is driven by a steam engine, a turbine, or an internal combustion engine.
Respuesta
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Constant speed
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Start and stop
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Dual
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Start and stop in conjunction with constant speed
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Variable speed
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